If people are lying about their experiences in a negative review, then that is a troll. But if they're relating a true event, just not framing it in a generous or tactful matter, well that's the whole point of review sections. You put your product out there and cross your fingers.
Keep this link handy (Best set it to 1w or 1m), and watch it for the next weeks; We'll see how Sansar's Steam usage develops. It's off to a 'strong' start.
'Strong' in the sense that it's the new VR thing on steam and of course thus beats out a couple of the others.
You can also see the peak caused by Steam at Sansar experiences - Metaverse Machines
I think metaversemachines gets quite accurate total numbers straight from the Sansar API. The steamDB Link gives us the Steam peaks to separate out the Steam users from MVM's total.
January will show how temporary or permanent the bump caused by the Steam join will be - but either way, it will not be anything 'big' anytime soon it seems.